Triple-valve device



mm. hm

. cl A. NELSON TRIPLE VALVE DEVICE Filed June 12, 1929 7 April 21, 1931.

, NW QN w s R a m A R m W u Patented Apr. 21, 1 931" UNITED STATES PATENT OFFICE otnunn anntsou, F winmnranms, PENNSYLVANIA, ass enon TO THE WESTING- nousnnin :ennxn comrn vv, or WILMERDING, PENNSYLVANIA, A conronnrion O EN YTS LYAN A TBUPLE-VALVE Permi Application fil ed .Tune 12, 1929. Serial No. 370,270.

This invention relates to fluid pressure brakes, and more particularly to means for securing a shigh brake cylinder pressure in an emergency application'of the brakes. I, The principal object ofzmy invention is to provide improved means for securing a high brake cylinder pressure in an emergency application of the brakes, in which the high pressuremayzbecobtained after one or more service applications of :the brakes.

In :the accompanying drawing, the single figure'is a diagrammatic view, partly in section, of a fluid pressure brake equipment embodying -my invention.

As shown in the drawing, the vequipment may comprise a triple valve device having at-casing 1 provided with a piston chamber '2, containing a piston '3 endhaving a valve chamber A containing a main slide valve 5 and agraduating valve 6 adapted to he-zoperated by piston e The piston chamber 2is connectedto the usual brake pipe 8 and the valve chamber 4 is lconnected to the usual auxiliary reservoir 9; The usual-brakecylinder .10 is con- .nected toza passage 111, leading :to the ,seat of slide valve 5. I :Inthe casing lismountedvanemergency high pressure valve ,device, comprising a piston 12 having piston chamber lit-at one side connected to a passage 14, which leads to the lseatcf slide valve 5.. The chamber 1 15 :at' the .oppositessideofithe piston 1 2;;is.

connected to ia passagel6, leading to the. seat 'ofqslide valvef5 and said chamber contains :a poppet valve 117 provided with 131 stem 18 which is adapted to engage theend of a v-stem i1i9, carried :by a poppet :valve 20, contained .in valve chamber 21.

The-valve chamber 21 is connected by a passage '22 to a supplemental reservoir-23 5 and, valve "controls communication :f-rom valve chamber 21 to a passage 24: which leads to passage 11 andtheretore communicates with the 1 brake cylinder 71110.

The piston 1L2 carries-a cage-25 and extending through an opening :inwthe; end wall 'ofthe-cage i-25is :;a stem 26 having screwthreaded-connection with the valve .17, {and a carried ,at, the, end of the stem 26 isahead service port V3.8. ,thengmoved untilthe [service port 38 regisjtBP-S with passage 1-1,;andthen fluidunder pressure is supplied from the valve; chamber t4 :and the auxiliary reservoir '9 to the brake 27 which engag s e end of a co l spring 28, contained within the cage 25.

The piston 12 has an equalizing port 29 for permitting the equalization of fluid pressure n pposi sides o the pis on and .said piston is provided with a seat rib 3O ,a lapte e gag a sea Bl, wh he pi ton 12 ;is shifted to the right. A spring :32 urges the valve 20 to'its seat and tends to hold the piston 12in the position shown.

In operation, with the brake pipe 8 cha g wi fluid under pressure, fluid fiowsto pisto hamber Z of the triple valve device, and withpiston 3 in release position,

assh-Qwn in e d w ng, flu d flowsth oug-h the usual teed groove '33 to valve chamber 4:, and thence to the auxiliary reservoir 9. The supplemental reservoir 23 is charged with .fluid under pressure ,from the valve h mbe 4:, through port 2s the s ide valve and passages 3. and 22-. The valve chambe 2 being connectedthrough pa sage 22 with the supplemental reservoir is also charged with fiuid frorn the supplementalzrieservoir. V i

In release position, the brake cylinder passag ;1 .is c nnect d oe haust passag 36, throughca-vity 37jinslicle valve 5, so that the brakes-are released.

'Upon a gradual reduction brake pipe pressure, the v-piston 3 is shifted toward :the left, first moving the graduating valve 6 so :as to close the port 31 and ,UJJCOVBI the Theinain slide valve 5 is cylinder 10 to effect a service application of the brakes in-the usual manner.

When the auxiliary reservoir. pressurehas been reducedyby flow to the brake cylinder,

to ,a degree slightlyless ,than thereduced brake pipe pressure, the piston 3 is shifted towardthe right, so that :the graduating .valve 6'is operated-to lapvgtheport 38., in the usual manner.

-- The hrakes may he released .by increasing the brake pipeipressure, so that the piston .8 is shifted to release position, in which t e seat ring 30 engages the seat 31.

teed groove 33 is uncovered, so that fluid is supplied nn the brake pipe to recharge the auxiiia y reservoir and the brake eylinder is connectal to the exhaust passa e 36.

is shifted to the eX- left and the main slide valve 5 is i :d so that emergency port 39 registers with passe e 11 and fluid then flows from the auxiliary reservoir to the brake cylinder. 2 my position, the passage 14 is in e i d to the valve chamber 4 through in slide valve 5, so that, as in release n, the piston chamber 13 of the high pressure emergency valve device is maintained cha d with fluid under pressure.

'fiy position, cavity 37 in slide cts passage 16 with passage 36, is vented from chamber to the at-inosp re, said chamber having been supplied h fluid under pressure in release position of the triple valve device from piston chamber 13, through the equalizing port 29.

The venting of fluid from chamber 15, at a faster rate than fluid can flow through the restricted port 29, causes the higher pressure in chamber 13 to shift piston 12, so that the A This movement of the piston causes the valve 20 to be unseated, so that'fluid under pressure is supplied from the supplemental.reservoir to the brare cylinder 10 by the pressure of spring 28 acting through the head 27, and at the same time, the valve 17 is shifted to its seat, so that communication from chamvalve 5 cm 0 tiat fillli;

ber 15 to the brake cylinder passage 24: is

out 01f.

By this means, loss of fluid pressure bytion between the valve 17 and the piston 12,

so that the valve 17 may seat and at the same time, wil not prevent the seating of the seat rib 30 of the piston 12 on the seat 31. It is desirable to provioe a seal between the chamber 13 and the chamber 15 when the parts are in emergency position, so as to prevent loss of fluid from the auxiliary reservoir by flow past the piston 12 to cham ber 15.

While one illustrative embodiment of the invention has been described in detail, it is not my intention to limit its scope to that embodiment or otherwise than by the terms of the appended claims.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. in a fluid pressure brake, the combination with a brake pipe, brake cylinder and a supplemental reservoir, of a valve for controlling the supply of fluid from said reservoir to the brake cylinder, a piston normally subject on opposite sides to fluid under pressure and operated upon venting 'iuid from one side to actuat said valve, means operative upon movement of said piston for cutting oil communication from one side of the piston to the other, a valve operated by said piston for cutting off communication from the vented side of said piston to the brake cylinder, means permitting movement of said piston relative to the last mentioned valve, and means operated upon a reduction in brake pipe pressure for venting fluid from one side of said piston.

2. In a fluid pressure brake, the combination with a brake pipe, brake cylinder and a supplemental reservoir, of a valve for controlling the supply of fluid from said reservoir to the brake cylinder, a piston normally subject on opposite sides to fluid under pressure and operated upon venting fluid from one side to actuate said valve, a seat ring carried by said piston for cutting oil communication from the fluid pressure side of said piston to the vented side upon movement or" said piston, a valve operated by said piston for cutting off communication from the vented side of said piston to the brake cylinder, a yielding connection between the last mentioned valve and said piston to permit the seat ring to .seat by a relative movement of the piston after said valve has seated, and means operated upon a reduction in brake pipe pressure for venting fluid from said piston.

3. In a fluid pressure brake, the combination with a brake pipe, brake cylinder, and a supplemental reservoir, of double beat valves, one of which controls the supply of fluid under pressure from-the supplemental reservoir to the brake cylinder, a piston normally subject on opposite sides to fluid pressure and operated by venting fluid from one side for operating said valves, the other of said double beat valves operating to cut of? communication from the vented side of said piston to the brake cylinder, and means operated upon a reduction in brake pipe pressure for venting fluid from said piston.

4. In a fluid pressure brake, the combina tion with a brake pipe, brake cylinder, and a supplemental reservoir, of double beat valves, one of which controls the supply of fluid under pressure from the supplemental reservoir to the brake cylinder, a piston normally subject on opposite sides to fluid pressure and operated by venting fluid from one side for operating said valves, the other of said double beat valves operating to cut off communication from the vented side of said piston to the brake cylinder, a seat ring carried by said piston for cutting off communication from the fluid pressure side of said piston to the vented side, upon movement of said piston, and means permitting a movement of said piston to seat the seat ring after the valve has seated which operates to cut off communication from the vented side ofsaid piston to the brake cylinder, and means operated upon a reduction in brake pipe pressure for venting fluid from one side of said piston. V V In testimony whereof I have hereunto set my hand this 10th day of- June, 1929,

CLAUDE A. NELSON. 

